Seal for refrigerating apparatus



April 8, 1941. A. A. MccoRMAcK 37.494

SEAL FOR REFRIGERAIING APPARATUS Filed Aug. 31, 1938 6 Sheets-Sheet 1 l A. MCORMACK ATTO EYS April 1941- 1 A. A. MccoRMAcK 2.237.494

SEAL {OR- REFRIGERATING APPARATUS Filed-"Aug. '31, 1938 s Sheets-Sheet 2 a F 7 11 //0 I a numngmfil lllllllll IN VENTOR.

ALEX AMTORMACK April 1941- A. M coRMAcK 2.23%494 s'mx. toR mmmme APPARATUS Filed Aug. 31, 1938 s Sheets-Sheet s INVENTOR. ALEXA. Mc OEMACK ATTOBNEYJ April 8, 1941.

A. A, M9CQRMAK SEAL FOR REFRIGERATING APPARATUS Filed Aug. 31, 193B e Sheets-Sheet s I I INVENTOR. ALEX K-L MCORM/JCK A TZRNEYS '1 llhlentecl drier. 8, 1914i NITED STATES PATENT OFFICE I 2,237,494 SEAL ron ncrmonimmo sersna'rns g Application August 31, 193%, Serial No. 22?,753

21 Claim.

This application is, in part, a continuation ol my copending applications Serial No. "133,2'ld, filed June 30, 1934, and Serial No. 745,95? filed September 28, 1934, and, in part a continuation oi copending application Serial No. 29,128 filed June 29, 1935.

This'lnvention relates to refrigerating appara tus and more particularly to compressors for use in refrigerating machines. The present invention aims to provide a seal which is of a relatively permanent character; but, if the same should wear out, the same can be replaced with a relatively small amount of labor. dnother object or the invention is to provide a seal ot a character such that the casing portion oi the seal automatically adjusts itself to the running portion of the seal.

Further objects and advantages of the present invention will he apparent from the following description, reference heing had to the accompanning drawings, wherein a preferred form of the present invention is clearly shown.

in. the drawings:

l is a view partly in cross-section of a compressor embodying the present invention, the essential elements of the rei'rigerating system helng shown diagrammatically; y

2 is a longitudinal cross-sectionoi a modified former the present invention showing parts at a refrigerating system diagrammatically.

t is a transverse cross-section on line of Fig. 2; llig. d is an enlarged view of a portion of Fig Fig. 5 is an enlarged view of a portion of Fig. ll; u

his. 6 'is a diagrammatic view, partly in crossscction, of a modification;

his. 7 is an enlarged view of a portion of Fig. t;

Fig.8is a sectional view of a portion of. a compressor embodying one formof the present invention and showing diagrammatically the essential elements of a refrigerating apparatus;

Fig. 9 is a lragrnentary section corresponding to Fig. 8 on a larger scale;

his. 101 is a fragmentary view of a. modified lorm ol pressin'e ring suitable for use in the structure oi Fig, 8;

Fig. ll a sectional view of a portion of a compressor emhodying the modified iorm of the invention; and

Fig. l2 is a tragnientary section corresponding to his. ill on a larger scale.

Referring now to Fig. i, there is shown a re- (tli. soc-n frigerating system comprising a compressor to having a discharge conduit in leading to a condenser it, which is in turn connected to a liquid refrigerant receiver i8 communicating by con- 5 duitcl8 with an evaporator so which may contain the usual float valve for controlling the expansion of liquid refrigerant into the evaporator 2t and connected by conduit to to the intake it of the compressor til. At low pressure con- 19 trol switch Ml is adapted to intermittently operate the motor til which drives the compressor shalt til by means at a belt drive it.

The compressor comprises the usual cylinder t t which may he termed integrally with a crank case to. d cover plate Fit is secured to the crankcase it hp holts it tor providing access to the interior of the crankcase. at one side of the crankcase tth there is provided a hearing dd for receiving one end oi the shaft it, a hall it being provided-to talre end threats against a screw tit which closes theend oi the hearing. the ohposite side oi the cranlrcase is formed with a tubular eirtensionilll which is hollow and forms an extension at the interior chamber of the crankcase. The extension is adapted to he closed by a cover plate till which is clamped to the ezrtension dd hr memos of a clamping plate 52, holts t t and a cachet The cover plate to has a central outwardly extending inwardly 3o projecting recess M which projects through a central opening to in the clamping plate ti. Recess lid is adapted to receive a packing washer ti winch mav he termed or a polymer of chlorofl-hutadicne-Lt, known in the trade as. Du-

5 prene and a hardened metallic sealing ring lit.

Shaft to is formed with a shoulder to against "which is placed a spring hacking plate 68.. A rotary sealing ring is located on the shafted- .jacent the sealing ring M is maintained in entu Easement with the sealing ring (it by a spring it interposed between the ring it and the spring plate it. it resilient packing member M is lo coated within a conical recess in the hack face of the ring "M and is forced into snug packing,

engagement between the ring it and the shaft 30 by means of a washer i6 and a spring it. In-

wardly of the shoulder 66, there is provided a second bearing w for the shaft to which is located entirely within the crankcase and which may be supported by a transverse strut 32 preferably formed integrally with the crankcase 36 and the bearing 80. The shaft 30 carries the usual eccentric M for reciprocating the piston 86 through the medium of the connecting rod 68 in the manner well known in the art.

In operation, shaft 30 is rotated by the motor 28 through the belt drive 32 which causes reciprocation of the piston 86 to compress gaseous refrigerant and circulate it through the refrigerating system in the well known manner. The sealing ring is maintained in snug running engagement with the sealing ring 64 by means of the spring 12. The ring 64 is stationary and fixed to the cover plate 50, as well as sealed thereto by means of the packing member 62', while the sealing ring 10 rotates with the shaft to which it is maintained in a fixed and gastight relation by means of the spring 18 compressing through the washer 16 on the packing 14. A body of lubricant is maintained in the bottom of the crankcase to a level such as that indicated by the line 90 and the repeated dipping of the eccentric 84 into the body of lubricant causes the same to be constantly splashed throughout the crankcase chamber. This provides lubrication for the moving parts of the compressor as is well known in the art and, in

addition, due to the fact that the rotary shaft seal mechanism is located in the same chamber with the main body of lubricant, provides a, constant bath of lubricant for all parts of the shaft seal. Inasmuch as the shaft seal is exposed directly to the intense splashing action of the eccentric in the lubricant, a far better lubrication is maintained on the seal than can be provided by other constructions wherein the seal is 10- coated in a separate chamber to which lubricant is fed by gravity or other means.

In Fig. 2, there is shown an embodiment of the invention applied to a rotary type of com-r pressor which is enclosed in a sealed casing having a compressor shaft extending through the casing to a motor located outside thereof. The casing may comprise a main frame or housing member IIO of annular shape having a cupshaped end cover II2 secured thereto by bolts H4 and a gasket H6. The cover H2 is provided with an outwardly extending boss II8 adapted to form a supporting lug for the device which may be insulated from the fixed support I20 by the resilient ring I22 formed of rubber or equivalent material.

The main frame H0 and the cover plate I I2 together form a chamber I 24 within which is supported by means of arms I26 (Fig. 2), a bearing plate I21 for rotary compressor I28, which may be of any well known type, and which forms,no part of the present invention. The open end of the frame IIO opposite the cover H2 is closed by a removable cover plate 130 secured to the frame IIO by bolts I32 and having an aperture for receiving the compressor shaft I34. A recess I36 is formed in the inner face of the plate I for the reception of a hardened metal stationary sealing ring I38 and a cupshaped sealing gasket- I40 which is preferably formed of a polymer of chloro-2-butadiene-1,3, whichmay be referred to, in the trade, as a synthetic rubber under the name of Duprene.

The rotary portions of the shaft seal comprise a two part slit washer I42 adapted, to be retained in a groove I44 in shaft I34 by means of a cupshaped spring backing plate I46. A rotary packing ring or sleeve I48 is maintained in snug running engagement with the stationary packing ring I38 by means of a spring I50 which acts on the ring I48 through the medium of 'a spring plate I52 and a resilient packing member I54' adapted to seal and frictionally engage the ring I48 to theshaft. The sleeve I48, as indicated by the cross-section in the drawings, is of metal and is provided with a rotative seal member I48 having a flat sealing face to provide a seal or ground fit between the relatively rotative seal members. The compressor shaft I34 carries outside the chamber I24 the rotor I56 of an electric motor which also includes the stator I58 and the frame ring I60 secured to the main frame IIO by bolts I62. A combination lubricating and sealing fluid is maintained in the chamber I24 up to about a level indicated by the line I64.

In operation, the electric motor under the control of the switch I65 rotates the compressor shaft I34 which in turn causes gaseous refrigerant to be withdrawn from the low side conduit I66 and compressor into the chamber I24 from whence it is circulated to the refrigerating system through the high side conduit I68 in a well known manner. The plates I46 and I52, as well as the spring I50 and sealing ring I48 having their lower portions dipping into the body of lubricant cause a violent churning action thereof, which in turn distributes lubricant in the form of a constant spray throughout particularly the right hand end of the chamber I24. This action causes the seal to be constantly lubricated in a running shower of lubricant and contributes materially to the long life of the seal without leakage.

In Fig. 6 the compressor 2I0 discharges into the condenser 2 having a liquid receiver 2I2 and from whence refrigerant is delivered to an evaporator 2I3 where the refrigerant is evaporated and returns through the pipe 2I4 to the crankcase 2I5 of the compressor. A motor 2I5a drives the compressor, starting and stopping in accordance with refrigeration conditions, such as under the control of a snap switch 2; actuated by a bellows 2I1 in response to the back pressure of the refrigerating system.

The crankcase 2I5 contains lubricant which is splashed by the eccentric 2I8 to the various bearings. Thus it is splashed into the cup 2I9 having a passageway 220 to the bearing near the seal 22I. Oil or other lubricant finds its way along the shaft to the running surface of the seal.

The seal is made at the wall 222 through which the shaft 222a passes.- A sealing running surface is provided on this Wall, preferably by inserting a metal ring 223, made of nitro-alloy or the like; along with a resilient rubber-like washer 224 into the recess 225 of the wall 222. A second metal ring 226 of leaded bronze alloy or the like is loosely placed on the shaft. A resilient rubber-like washer 221 is'placed with one of its faces against the ring 226 and another face against the rim 234 of the cup-like member 228 which is sealed to the shaft outside of the wall 222. The cup-like member 228 has its bottom portion 229 sealed to the shaft, for example, by providing a shoulder 230 on the shaft against which a rubber-like washer 23I is sealed by the threaded extension 233 of the cup-like member 228. The cup-like member 228 is screwed onto the shaft so that the extension 233 of bottom portion 229 is sealed to the shaft.

Means are provided for resiliently urging the washer 221 against the ring 226 and against the rim 234 of the cup. The rim 234 is directed towards the wall 222 and a coiled spring 235 is placed within the cup so that one end is pressed against the bottom 228 and the other end is pressed against the metal washer 236 which in turn presses against the resilient washer 221.

eaample, bronze.

"nus causes the washer 227 to expandmutwardly and seal againshthe rim 234 and also against the ring 225. The ring 223 rotates with the shaft because of the frictional driving power of washer 221'. The sealing running surfaces upon the contacting faces of the rings 223 and 22B are suitably ground or lapped so that fluid does not escape therethrough.

. The seal thus constructed prevents gases or lubricant from passing around the outside of-the ring 223 by virtue of the rubber-like washer 225. The running surfaces 231 are fluid-tight, and the washers 22'! and 23! prevent the passage of fluids past the faces against which they bear. This seal can be readily applied and removed from the mechanism since it is only necessary to screw or unscrew the cup 228 from the shaft and the other parts are readily applied or removed longitudinally of the shaft in a manner which is obvious from the disclosure.

Referring now to Fig. 8, there is illustrated diagrammatically the essential elements of a refrigerating apparatus which include a compressor 3W, a condenser 3l2, receiver 3, expansion valve 316 and an expansion coil 3I8 connected in series in the order named which operate to withdraw heat from an object to be cooled into the evaporator 3"! and to dissipate the heat from the condenser 312 to the surrounding air or other cooling medium. The compressor has a crank ring 332 and which has the characteristic of not adhering to the solder used to seal the bellows to the ring 332. For example, the bearing ring 348 may be formed of aluminum. The bellows 334 is soldered at its outer end to the'bellows plate 336 and at its inner end to the ring 332. In addition, if desired, the bellows may be soldered to the spring plate 346, although this is not essential to the maintenance of a fluid-tight seal. i

In operation, as the shaft 320 rotates, the ring 326 and gasket 328 rotate therewith, due to the snug engagement therebetween provided by the gasket 328. The sealing ring 332 is stationary except for the slight axial movement necessary to take up wear and provides a running seal between the abutting faces of the rings 328 and 332.

The spring 344 maintains the ring 332 in en- 7 348 is not transmitted to the sealing ring 332.

shaft 32!] extending through a bearing 322 which forms an aperture in the wall 324 in the crankcase of the compressor. Suitable driving means for the compressor (not shown) coact with the outwardly extending end of the crank shaft 320 p v to cause rotation of the same.

In order to efiectively seal the joint between the shaft 323 and the wall aperture 322, a shaft seal is provided which comprises a stationary sealing ring 325 formed of extremely hard metal having a generally rectangular cross-section with the corners somewhat rounded orrelieved. The ring 325 is supported in a 'gasket 323 which is formed to surround three sides of the ring 326, or in other words, comprises 'a flat annular portion having inner and outerjcylindrical portions integrally attached thereto. The ring 326 and gasbet 3% are pressed snugly against a shoulder 333 iormed on the shaft 323. Due to the particular term of the gasket 323, the ring 326 when pressed toward the shoulder 333 causes a snug and fluidtight frictional sealing and driving fit between the ring 323 and the shaft 320. The gasket 323 is preferably formed of a resilient rubber or rubber-like material capable of withstanding the de teriorating effects of common refrigerants and lubricants and may'comprise for example a polyliner of chloro-2-butadiene-L3, known in the trade as Chloroprene. or Duprene. Coacting with the hard sealing ring 325 is an axially movable sealing ring 332 formed of a softer metal, for

The sealing ring 332 is hermetically sealed to the wall 324 by means of a bellows 333, a bellows plate 336 and a gasket 333. it clamping plate 343 removably secures the bellows plate 333 to the wall 324 by means of the gagement with the ring 326 and it will be noted that due to the inter-position of the bearing ring 343 of comparatively soft material that any warpage which may occur in the spring plate By this construction, the running face of.. the ring 332 is always maintained perfectly flat, thus contributing materially to the maintenance of a fluid-tight seal throughout a long period of useful life.

' In Fig, 10, there is disclosed a modified form "of bearing ring 350 whichmay be usedin place of the bearing ring 338. The ring 350 has such a cross-sectional shape that it contacts with the spring plate 346 and with the sealing ring 332 in a line contact. By this construction, the ring 35!! need not be of softer material than the ring 332 and the spring plate 333, although it is praierable to have it so and in addition, a somewhat greater latitude of warpage in the spring plate 348 is permissible without affecting the ring 332.

Referring now to Figs. 11 and 12, there is disclosed, a similar shaft seal-in which the corresponding' primed referencenumerals refer to shaped ring or gasket 353 preferably formed of the same material as the gasket 323. Also in this form of the invention, the bellows 333 is soldered to the spring plate 346 but not to the sealing ring 33 The rubber-like characteristics of the bearing ring or gasket 332 provide a hermetic seal as well as a tight frictional fit between the spring plate 346' and the ring plat 332'. it will be seen that the resilience of the gasket 352 also till bolts 3%. In order to maintain the ring 332 in permits a considerable degree of warpage to take place in the spring plate 343' without causing any warpage in the sealing ring 332'.

Tins application is a -continuation-in-part cl applications S. N. 733,279, S. N. 29,128 and S. N.

In all or the modifications, where the crosshatching indicates a rubber-like construction. either rubber or other resilient material may be used. A compound the base of which is made irom the polymers of chloro-2-butadiene-l,3 may also be used. This seal is useful in retaining the ordinary lubricants and refrigerants used in domestic refrigerating systems. Ordinary mineral oils-and usual refrigerants such as sulphur dioxide, any volatile hydrocarbon compounds or .7

their derivatives may be retained. Where the polymer composition above referred to is used, it is particularlyuseful in retaining the halofluoro which follow.

What is claimed is as follows:

1. The combination of a housing member, a shaft extending through the housing member and rotatable with respect thereto, and a seal between the shaft and the housing member including a sleeve rotatably mounted wit-h and sealed at one end to the shaft, and rotative seal members, one of which is carried by said sleeve and the other of which is carried by said housing member; said seal members being of metal and forming a running seal, and the one carried by said housing member being a removable insert therein and being secured thereto and sealed therein by a cup-shaped rubber washer which permits said insert to adjust itself to the other seal member.

2. The combination of a housing, a shaft extending through said housing and rotatably journaled .therein, a cover for said housing surrounding said shaft, and a seal between said shaft and said cover including a resilient sleeve rotatably mounted with and sealed at its inner end to said shaft, and rotative seal members, one of which is carried by said sleeve and the other of which is carried by said cover; said seal members being of metal and forming a running seal, and the one carried by said cover being a removable insert therein and being secured thereto and sealed therein by a cup-shaped rubber washer which permits said insert to adjust itself to the other seal member.

3. The combination of a housing, a shaft extending therethrough and rotatably journaled therein, a cover secured to said housing and surrounding said shaft, and a seal between said shaft and said cover including a rubber washer having a radial portion bearing against a shoulder. on said shaft and having a sleeve portion extending along said shaft, a sealing unit bearing against both portions of said rubber and sealed by it to said shaft and rotated by it with the shaft, and a companion seal member carried by said cover and having a gas-tight rotative fit with said seal unit.

4. In a compressor including a housing containing compressor apparatus and gas to be compressed, a shaft extending through said housing and rotatably journaled therein for driving said apparatus, and a seal between said shaft and said housing including a pair of seal members having a ro'tatably sliding fit, one of said members, being secured to said housing and the other of said members being supported on said shaft and sealed thereto and rotated therewith by a resilient washer having a sleeve portion pinched between said shaft and said last named member and except for said washer being free to turn with respect to said shaft.

5. The combination of a housing member, a shaft extending therethrough and rotatable with respect thereto and having an annular shoulder facing the housing member, and a seal between the shaft and the housing member including a rubber washer having a radial portion bearing against the shoulder on the shaft and having a sleeve portion extending along the shaft, a sleeve -unit having one end bearing against both portions of the rubber washenand pinching the sleeve portion thereof against the shaft and having a running seal surface at its other end, and a ring having a companion running seal surface and carried by the housing member and engaging the first named running seal surface to eflectua'te a seal therewith while permitting its r0- tation.

6. The combination of a housing member, a shaft extending therethrough and rotatable with respect thereto and having an annular shoulder facing the housing member, and a seal between the shaft and the housing member including a rubber washer having a radial portion bearing against theshoulder on the shaft and having a sleeve portion extending along the shaft, a sleeve unit having one end bearing against both portions of the rubber washer and pinching the sleeve portion thereof against the shaft and having a running seal surface at its other end, and a ring having a companion running seal surface and carried by the housing member and engaging the first named running seal surface to effectuate a seal therewith while permitting its rotation, said ring being secured in the housing member by a cup-shaped washer which permits the ring to adjust itself to the first running seal surface.

7. The combination of a housing member, a shaft extending therethrough and rotatable with respect thereto and having an annular enlargement facing generally toward the housing member, and a seal between the shaft and the housing member including a rubber washer bearing against said enlargement, a .sleeve unit having one end bearing against the rubber washer in both axial and radial directions and squeezing it against the shaft in both axial and radial directions, and having a running seal surface at the other end, a ring having a companion running seal surface and carried by the housing member and engaging. the first named running seal surface to effectuate a seal therewith while permitting its rotation, and means for exerting a thrust between the sleeve member and the shaft and between the running seal surfaces.

8. The combination of a housing member, a shaft extending therethrough and rotatable with respect thereto and having an annular enlargement facing generally toward the housing member, and a seal between the shaft and the housing member including a rubber washer bearing against said enlargement, a sleeve unit having one end bearing against the rubber washer in both axial and radial directions and squeezing it against the shaft in both axial and radial directions, and having a running seal surface at the other end, a ring having a companion running seal surface and carried by the housing member and engaging the first named running seal surface to effectuate a seal therewith while permitting i'ts rotation, and means for exerting a thrust between the sleeve member and the shaft and between the running seal surfaces; the end of the sleeve carrying a running seal surface having a clearance with the shaft to permit play with respect thereto.

9. The combination of a housing, a housing member removably sealed to the housing, a shaft extending from the housing and journaled therein and having an annular enlargement facing generally toward the housing member, and a seal between the shaft and the housing member including a resilient said enlargement, a sleeve unit having one end bearing against the resilient washer and squeezwasher bearing against accuse ing it against the shaft in both axial and radial sleeve unit and the shaft and wedged therebetween whereby the accurate positioning oi the sleeve unit with respect to the shaft and a high scaling pressure are obtained and slippage between the sleeve unit and the shaft is-prevented.

ill. The combination of a housing member, a shaft extending through the housing member and rotatable with respect thereto, and a seal between the shaft and the housing member ineluding a sleeve rotatably mounted with and sealed at one end to the shaft, and rotative seal members, oneof which is carried by said sleeve andthe other of which is carried by said housing member; said seal members being of metal and forming a running seal, and the one carried by said housing member being a removable insert in an oversize recess therein and betends, a recess surrounding said aperture, a flexible stationary washer resting within said recess against an outwardly directed face of said wall, said washer having an annular recess, a

, metal ring resting within said recess of said washer and having an outwardly directed sealing running surface away from said wall, a second metal ring having a sealing running surface in contact with the sealing running surface or said first metal ring, a second flexible washer in contact with said second metal ring, a metal ring member threaded directly on to the shalt in contact with said second iieidble washer, all parts of the wall structure of said casing wall lying on the opposite side of the plane oi the sealing running surface from the threaded member.

14. In a compressor shaft seal, the combina tion of a wall member having an aperture, a shaft member passing through said aperture, an axially stationary sealing ring associated with one of said members, an axially movable sealing ring ing sealed therein and restrained from turning by a rubber washer which is positioned in part between the bottom of the recess and the seal member therein extending into the annular space between the sides of the seal member and the recess and which permits said insert to adlust itself to the other seal member.

ill. a shaft seal comprising a shaft, a casing wall surrounding an enclosure, said casing wall having an aperture through which the shaft errtends, said aperture being provided with a counterbore, a flexible stationary washer resting within said counterbore against an outwardly directed iace oi said wall, said flexible stationary washer being substantially L-shaped in cross section, a metal ring received within the periphcry at said stationary washer and resting against said washer and having an outwardly directed sealing running surface away from said wall, a second metal ring having a sealing running sur i'ace in contact with the sealing running surface at said first metal ring, a second flexible washer in contact with sa d secondmetal ring, a metal ineniher contacting said flexible washer and said shalt, a, third flexible washer for sealing said member to said shaft, said metal member being provided with threaded fastening means for holding said third flexible washer in tight sealinc engagement with the shaft.

it. it shai t seal comprising a shaft, a casing wall surrounding an enclosure, said casing wall having an, aperture through which the shaft extends, a recess surrounding said aperture, a iiexiblestationary washer resting within said r'ecessanainst an outwardly directed face at said wall, said washer having an annular recess,- a metal ring resting within said recess of said washer and having an outwardly directed sealing running surface away from said wall, a second metal ring having a sealing running surface in contact with the sealing running surface oi said first metal ring, a second flexible washer in contact with said second-metal ring, a metal ring member threaded directly on to the shaft in contact with said second flexible washer.

it, it shaft seal comprising a shaft, a casing i wall surrounding an enclosure, said casing wall having an aperture through which the shaft ex associated with the other member, meansiorming a shouldered seat for one of said rings, and l a gasket of resilient material between said ring and said seat, said gasket being formed of a flat annular portion having integral inner and outer cylindrical portions, said outer cylindrical'portion being around said ring, and said ring. being around said inner cylindrical portion.

15. In a compressor shaft seal, the combination of a wall member having an aperture, a shaft member passing through said aperture, an axially stationary sealing ring associated with one of said members, an axially movable sealing ring associated with the other member, means forming a shouldered seat for one of said rings, and a gasket of resilient material between said ring and said seat, said gasket being formed oi a flat annular portion having an integral cylindrical portion at the outer edge oi the annular portion around said ring.

16. In a compressor shaft seal, the combina-= tion of a wall member having an aperture, a shaft member passing through said. aperture, an axially stationary sealing ring associated with one of said members, an axially movable sealing ring associated with the other member, bellows means for sealing said second ring to said other member in all positions of axial adjustment, a spring for urging said second ring into engagement with the first, and a spring plate for transmitting the force of the spring to the second ring, said bellows means being soldered to said spring plate and said sealing ring andmeans including an annular member oi a material to which the solder does not adhere interposed between the second ring and the spring plate to provide a floating engagement therebetween by a portion oi said bellows means.

17. In a compressor shalt seal, the combination of a wall member having an aperture, a

shaft member passing through said aperture, an

cylindrical portion, said ring being around said inner cylindrical portion, 'said two portions to--- gether forming an annular member L-shaped in cross section.

lbuln a compressor shaft seal, the combination of a Wall member having an aperture, a shaft member passing through said aperture and having a shouldered seat, an axially stationary seal ing ring associated with said shaft member, an axially movable sealing ring associated with said wall member, and a gasket of resilient material between said ring and seat, said gasket being formed of a flat annular portion having integral inner and outer cylindrical portions, said outer cylindrical portion being around said ring and said ring being around said inner cylindrical portion, said flat portion together with the inner and outer cylindrical portions forming an annular member substantially U-shaped in cross section.

19. In a compressor shaft seal, the combination of a wall member having an aperture, a shaft member passing through said aperture and having a shouldered seat, an axially. stationary sealing ring associated with said shaft member, an axially movable sealing ring associated with said wall member, and a gasket of resilient material between said ring and seat, said gasket being formed of a flat annular portion having an in-.

tegral cylindrical portion at the outer edge of the annular portion around said ring, said two portions together forming an annular member having an L-shaped cross section.

20. In a compressor shaft seal, the combination of a wall member having an aperture, a

shaft member passing through said aperture and having a shouldered seat, an axially stationary sealing ring associated with said shaft member, an axially movable sealing ring associated with said wall member, and a gasket of resilient material between said ring and seat, said gasket being formed of a radially extending fiat annular portion having an integral inner cylindrical portion, said ring being around said inner cylindrical portion, said two portions together forming an annular member having an L-shaped cross section.

21. The combination of a housing, a shaft extending through said housing and rotatably journaled therein, closure means carried by said housing surrounding said shaft, and a seal between said shaft and said closure means including a resilient sleeve rotatably mounted. with and sealed at its inner end to said shaft, and rotative seal members, one of which is carried bysaid sleeve and the other of which is carried by said closure means; said seal members being of metal and forming a running seal, and the one carried by said closure means being an insert therein and being secured thereto and sealed therein by a substantially cup-shaped rubberlike washer which permits said insert to adjust itself to theother seal member.

ALEX A. MCCORMACK. 

